Start using SourcedSet for emoticon sets so that, in the future, special events, featured channels, etc. can add and remove emote sets without worrying about reference counting or anything like that. Also implement the method to get your Twitch Inventory emote sets.

src/utilities/object.js

@@ -164,4 +164,76 @@ export function maybe_call(fn, ctx, ...args) {
 	}
 
 	return fn;
+}
+
+
+export class SourcedSet {
+	constructor() {
+		this._cache = [];
+	}
+
+	_rebuild() {
+		if ( ! this._sources )
+			return;
+
+		this._cache = [];
+		for(const items of this._sources.values())
+			for(const i of items)
+				if ( ! this._cache.includes(i) )
+					this._cache.push(i);
+	}
+
+	get(key) { return this._sources && this._sources.get(key) }
+	has(key) { return this._sources ? this._sources.has(key) : false }
+
+	delete(key) {
+		if ( this._sources && this._sources.has(key) ) {
+			this._sources.delete(key);
+			this._rebuild();
+		}
+	}
+
+	extend(key, ...items) {
+		if ( ! this._sources )
+			this._sources = new Map;
+
+		const had = this.has(key);
+		this._sources.set(key, [false, items]);
+		if ( had )
+			this._rebuild();
+		else
+			for(const i of items)
+				if ( ! this._cache.includes(i) )
+					this._cache.push(i);
+	}
+
+	set(key, val) {
+		if ( ! this._sources )
+			this._sources = new Map;
+
+		const had = this.has(key);
+		this._sources.set(key, [val]);
+
+		if ( had )
+			this._rebuild();
+
+		else if ( ! this._cache.includes(val) )
+			this._cache.push(val);
+	}
+
+	push(key, val) {
+		if ( ! this._sources )
+			return this.set(key, val);
+
+		const old_val = this._sources.get(key);
+		if ( old_val === undefined )
+			return this.set(key, val);
+
+		else if ( old_val.includes(val) )
+			return;
+
+		old_val.push(val);
+		if ( ! this._cache.includes(val) )
+			this._cache.push(val);
+	}
 }